diff options
author | Kshitiz Gupta <kshitiz.gupta@ni.com> | 2016-07-16 10:23:45 +0300 |
---|---|---|
committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2016-08-16 20:32:59 +0300 |
commit | 0066c8b6f4050d7c57f6379d6fd4535e2f267f17 (patch) | |
tree | abdad4138d3ee1495bbd197a6ae613f3363d5e8f /drivers/net/ethernet/intel/e1000e/e1000.h | |
parent | a1560dd7a47f983419760aa7f6a481e3b910b54b (diff) | |
download | linux-0066c8b6f4050d7c57f6379d6fd4535e2f267f17.tar.xz |
igb: fix adjusting PTP timestamps for Tx/Rx latency
Fix PHY delay compensation math in igb_ptp_tx_hwtstamp() and
igb_ptp_rx_rgtstamp. Add PHY delay compensation in
igb_ptp_rx_pktstamp().
In the IGB driver, there are two functions that retrieve timestamps
received by the PHY - igb_ptp_rx_rgtstamp() and igb_ptp_rx_pktstamp().
The previous commit only changed igb_ptp_rx_rgtstamp(), and the change
was incorrect.
There are two instances in which PHY delay compensations should be
made:
- Before the packet transmission over the PHY, the latency between
when the packet is timestamped and transmission of the packets,
should be an add operation, but it is currently a subtract.
- After the packets are received from the PHY, the latency between
the receiving and timestamping of the packets should be a subtract
operation, but it is currently an add.
Signed-off-by: Kshitiz Gupta <kshitiz.gupta@ni.com>
Fixes: 3f544d2 (igb: adjust ptp timestamps for tx/rx latency)
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/e1000e/e1000.h')
0 files changed, 0 insertions, 0 deletions